What is the difference between Iphone 4, 5&6?

I'm wanting to upgrade my phone, Verizon is the only server that gets reception in our area, I can go to iphone 4 from my droid for only a $30 transfer fee, iphone 5 and 6 would be a larger out of pocket expense. What would I be gaining by paying for the newer models?

IPhone 6 has not been released yet. The iPhone 5 is not much better than the iPhone 4 or iPhone 4s. I have an iPhone 5. The only real difference is that the headphone jack is on the bottom and the charger is different and you can plug the charger in either way unlike the iPhone 4 charger, it has to be plugged it with the symbol pointed towards you (it's not complicated, just a extremely minor difference).

The iPhone 5 DOES have much faster data (LTE), but that feature is not a huge upgrade from an iPhone 4 or iPhone 4s. It would help if you typed what features were most important to you on a phone.

For starters, there's no iphone 6.

IPhone 6 not launched yet.

Difference between iPhone 4 and iPhone 4S:
The Apple iPhone 4 made huge waves when it was launched in June 2012 as the successor for iPhone 3GS. It was marketed with the intention of promoting video calling. The iPhone 4 offered a new design and incorporated an uninsulated stainless steel frame that acts as the device's antenna. The iPhone 4S was an update that was released after much anticipation in October 2011.It was the fifth generation of the iPhone and succeeded the iPhone 4.In terms of appearance, the phone resembles the iPhone 4 in many ways.

Difference between iPhone 4 and iPhone 5:
The Apple iPhone 4 made huge waves when it was launched in June 2012 as the successor for iPhone 3GS. It was marketed with the intention of promoting video calling. The iPhone 4 supports a 3.5 inch LED-backlit IPS LCD, capacitive touchscreen with 640 x 960 pixels and 16 million colors. The iPhone 5 is the latest innovative product of the Apple Company. They have made the new phone slicker, thinner and lighter with even more packed features. IPhone 5, bigger than its predecessors, supports a 4-inch LED-backlit IPS LCD screen with 640 x 1136 pixels and 16 million colors.

Difference between iPhone 4S and iPhone 5:
The iPhone 4S was an update that was released after much anticipation in October 2011.It was the fifth generation of the iPhone and succeeded the iPhone 4.In terms of appearance, the phone resembles the iPhone 4 in many ways. The iPhone 5 is the latest innovative product of the Apple Company. They have made the new phone slicker, thinner and lighter with even more packed features. IPhone 5, bigger than its predecessors, supports a 4-inch LED-backlit IPS LCD screen with 640 x 1136 pixels and 16 million colors.